Datasheet

EL8172
Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifiers

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Typical Diagram

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Key Features

95µA maximum supply current
Maximum input offset voltage

300µV (EL8172)
1500µV (EL8171)

50pA maximum input bias current
450kHz -3dB bandwidth (G = 10)
170kHz -3dB bandwidth (G = 100)
Single supply operation

Input voltage range is rail-to-rail
Output swings rail-to-rail
Ground sensing

Pb-free (RoHS compliant)

Description

The EL8171 and EL8172 are micropower instrumentation amplifiers optimized for single supply operation over the +2.4V to +5.5V range. Inputs and outputs can operate rail-to-rail. As with all instrumentation amplifiers, a pair of inputs provide very high common-mode rejection and are completely independent from a pair of feedback terminals. The feedback terminals allow zero input to be translated to any output offset, including ground. A feedback divider controls the overall gain of the amplifier.

The EL8172 is compensated for a gain of 100 or more, and the EL8171 is compensated for a gain of 10 or more. The EL8171 and EL8172 have PMOS input devices that provide sub-nA input bias currents.

The amplifiers can be operated from one lithium cell or two Ni-Cd batteries. The EL8171 and EL8172 input range goes from below ground to slightly above positive rail. The output stage swings completely to ground (ground sensing) or positive supply - no pull-up or pull-down resistors are needed.